Sclerites are joined to each other by which structure in a cockroach?

In the given figure,which part represents the hypopharynx?

Which of the following statement$(s)$ is/are correct regarding cockroaches?
$(i)$ The body of the cockroach is segmented and divisible into three distinct regions - head,thorax and abdomen.
$(ii)$ Blood vascular system is of closed type.
$(iii)$ They are monoecious and both sexes have well developed reproductive organs.
$(iv)$ The development of $P. americana$ is paurometabolous,meaning there is development through nymphal stage.

The wings of a cockroach primarily help in ...........

Body segments are distinct and jointed in which of the following?

Male and female cockroaches can be distinguished morphologically by the presence of: